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Related party balances and transactions - Transactions (Details) - CNY (¥) ¥ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Purchase of products and services
Related party balances and transactions
Amount of transaction	¥ 376,504	¥ 216,079
Rental of office space, and administrative services
Related party balances and transactions
Amount of transaction	2,168	2,400
Other income from related party
Related party balances and transactions
Amount of transaction	0	7,055
Interest income on loans
Related party balances and transactions
Amount of transaction	5,899	6,771
Interest expense on borrowings
Related party balances and transactions
Amount of transaction	7,706	6,116
Loans to related parties
Related party balances and transactions
Amount of transaction	9,800	12,000
Repayment received of loans to related parties
Related party balances and transactions
Amount of transaction	17,700	8,500
Repayment of borrowings from related parties
Related party balances and transactions
Amount of transaction	100,000	0
Borrowings from related parties
Related party balances and transactions
Amount of transaction	¥ 449,000	¥ 300,000

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

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-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
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